Its not ACTUALLY 5x, 5x is just as far as I could find the maximum any NPC had set. The actual range is much smaller although I don't have the Wii U version right now to test what the actual min/max slider values are, but I think they're at least closer to 0.5 and 1.5. Certain bodies seem to have different values and the math seems to cap out after a point anyway, and I only tested on one body (the 5th one) so I felt it was best to include them just to be safe. You can definitely experiment with the values however, just change the value to whatever float value in that 0.5-1.5 range and see how it affects your character (I don't actually know if 1.0 is always the default either, its not for height but height scales REALLY weirdly, at least on the body i tested it was all within a like 0.9-1.0 range for slider values.
Either way, here's a completed text file, has a bunch of Chest codes + the example codes I posted earlier (to demonstrate how much this pointer covers). Note, if you want to fiddle with the Chest values, they're float values, not integers, so make sure to account for that. You can also set the 3 values independently, I just used a loop since I assumed most people would rather have it be easy and set them all the same.